There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Zimbabwe - a landlocked republic in south central Africa formerly called Rhodesia; achieved independence from the United Kingdom in 1980. Republic of Zimbabwe, Rhodesia, Southern Rhodesia. capital of Zimbabwe, Harare, Salisbury - the capital and largest city of Zimbabwe.